Standard pistol primers will begin to flatten at about 20~30k psi, dependant upon manufacturer and magnum versus regular. Thinking of a 9mm can operate as large as 35k psi for normal hundreds and as much as 38,five hundred psi for 9mm +P, there isn't any question . Add to quote https://josuererbm.liberty-blog.com/31942671/5-essential-elements-for-federal-215-gold-medal-match-primers